Initialize

.travis.yml

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+name: Scratchip Binary CI
+language: generic
+env:
+  - VER=3.3.2 MILL_VERSION=0.7.3
+before_deploy:
+  - curl --fail -L -o mill https://github.com/lihaoyi/mill/releases/download/$MILL_VERSION/$MILL_VERSION-assembly
+  - chmod +x mill
+  - wget https://github.com/freechipsproject/chisel3/archive/v$VER.zip
+  - unzip v$VER.zip
+  - cd chisel3-$VER
+  - ../mill chisel3[2.12.11].assembly
+  - mv out/chisel3/2.12.11/assembly/dest/out-tmp.jar chisel3-$VER.jar
+  - cd ..
+  - mkdir -p lib
+  - cp chisel3-$VER/chisel3-$VER.jar lib
+  - make verilog
+  - tar czvf cache.tar.gz .cache
+deploy:
+  provider: releases
+  api_key: $GITHUB_TOKEN
+  file:
+    - lib/chisel3-$VER.jar
+    - cache.tar.gz
+    - mill
+  skip_cleanup: true
+  on:
+    tags: true

Makefile

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+export COURSIER_CACHE=.cache
+
+verilog:
+	./mill chisel.run -td builds
+

build.sc

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+import mill._, scalalib._
+import ammonite.ops._
+import java.nio.file.Paths
+
+object chisel extends ScalaModule {
+  def scalaVersion = "2.12.6"
+  def scalacOptions = Seq(
+    "-Xsource:2.11",
+  )
+  def millSourcePath = super.millSourcePath / ammonite.ops.up
+
+  def unmanagedClasspath = T {
+    val lib_path = T.ctx.env.get("MILL_LIB") match {
+      case Some(lib) => Path(Paths.get(lib).toAbsolutePath)
+      case None      => millSourcePath / "lib"
+    }
+    if (!ammonite.ops.exists(lib_path)) Agg()
+    else Agg.from(ammonite.ops.ls(lib_path).map(PathRef(_)))
+  }
+}

src/Top.scala

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+import chisel3._
+import chisel3.util._
+
+class Top extends Module {
+  val io = IO(new Bundle{})
+  /** Define your code here
+   *
+  val io = IO(new Bundle{
+    val sel = Input(UInt(1.W))
+    val in0 = Input(UInt(1.W))
+    val in1 = Input(UInt(1.W))
+    val out = Output(UInt(1.W))
+  })
+  io.out := (io.sel & io.in1) | (~io.sel & io.in0)
+  */
+}
+
+object Main extends App {
+  Driver.execute(args, () => new Top)
+}